How to: Build a Gigantic DIY Pumpkin Cannon

Straying slightly from our usual daily doses of electronics and hacking, today we’re getting into the spirit of Fall by showing off some extraordinary pumpkin cannons.Â First up is the world’s most powerful cannon capable of launching a squash 1 mile with an initial velocity of 600 mph!Â Downright incredible stuff.Â Did you know they have annual competitions for these beasts?